74 lines
2.5 KiB
C
74 lines
2.5 KiB
C
/*
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* Licensed to the OpenAirInterface (OAI) Software Alliance under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership.
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* The OpenAirInterface Software Alliance licenses this file to You under
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* the OAI Public License, Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.openairinterface.org/?page_id=698
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*-------------------------------------------------------------------------------
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* For more information about the OpenAirInterface (OAI) Software Alliance:
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* contact@openairinterface.org
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*/
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#include "nr_pdcp_security_nea2.h"
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#include <stdlib.h>
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#include <string.h>
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#include <nettle/nettle-meta.h>
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#include <nettle/aes.h>
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#include <nettle/ctr.h>
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#ifndef NETTLE_VERSION_MAJOR
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/* hack: include bignum.h, not version.h because version.h does not exist
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* in old versions and bignum.h includes version.h (as of today).
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* May completely fail to work... maybe we should skip support of old
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* versions of nettle.
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*/
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#include <nettle/bignum.h>
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#endif
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void *nr_pdcp_security_nea2_init(unsigned char *ciphering_key)
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{
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void *ctx = calloc(1, nettle_aes128.context_size);
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if (ctx == NULL) exit(1);
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#if !defined(NETTLE_VERSION_MAJOR) || NETTLE_VERSION_MAJOR < 3
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nettle_aes128.set_encrypt_key(ctx, 16, ciphering_key);
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#else
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nettle_aes128.set_encrypt_key(ctx, ciphering_key);
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#endif
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return ctx;
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}
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void nr_pdcp_security_nea2_cipher(void *security_context,
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unsigned char *buffer, int length,
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int bearer, int count, int direction)
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{
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unsigned char t[16] = {0};
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t[0] = (count >> 24) & 255;
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t[1] = (count >> 16) & 255;
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t[2] = (count >> 8) & 255;
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t[3] = (count ) & 255;
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t[4] = ((bearer-1) << 3) | (direction << 2);
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nettle_ctr_crypt(security_context, nettle_aes128.encrypt,
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nettle_aes128.block_size, t,
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length, buffer, buffer);
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}
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void nr_pdcp_security_nea2_free_security(void *security_context)
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{
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free(security_context);
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}
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